#!/bin/bash

function s1_generate_a_series_of_files() {
    for i in {1..100}; do
        echo -n "$i" > "/tmp/new_file$i"
    done
}

function  s2_list_4_files_in_long_format_about_account_and_group() {
    ls -l /etc | grep -E 'passwd|group|gshadow|shadow' | sort -d
}

function s3_find_items_related_to_given_username() {
	grep -h $1 /etc/{passwd,shadow} |sort -d
}

function s4_find_items_related_to_given_group_name() {
	grep -h $1 /etc/{group,gshadow} |sort -d
}

function s5_create_groups_for_given_group_names() {
    groupadd rnd 
    groupadd itoperation
}

function s6_create_users_and_set_their_group_as_required() {
	useradd -G rnd adam
	useradd -G rnd bob
	nseradd -G rnd edward
	useradd -G itoperation calvin
	useradd -G itoperation david

   # local usernames=("adam" "bob" "calvin" "david" "edward")
   # local groups=("rnd" "rnd" "itoperation" "itoperation" "rnd")
   # for (( i=0; i<5; i++ )); do
   #     useradd "${usernames[$i]}"
   #     usermod -aG "${groups[$i]}" "${usernames[$i]}"
   # done
}

function s7_change_users_shell() {
    local users_with_sh=("adam" "edward")
   for user in "${users_with_sh[@]}"; do
        usermod -s /usr/bin/sh "$user"
    done
}

function s8_set_password_change_policy() {
	passwd -n 10 -x 60 -w 10 adam
	passwd -n 10 -x 60 -w 10 bob
	passwd -n 10 -x 60 -w 10 edward
	passwd -n 10 -x 60 -w 10 calvin
	passwd -n 10 -x 60 -x 10 david
}

function s9_set_password_for_five_users() {
    usernames=(adam bob calvin david edward)
	for i in $(seq 1 5);do echo ${!i};echo $(($i-1));done
	echo "${usernames[0]}:$1" | chpasswd
	echo "${usernames[1]}:$2" | chpasswd
	echo "${usernames[2]}:$3" | chpasswd
	echo "${usernames[3]}:$4" | chpasswd
	echo "${usernames[$(($i-1))]}:$5" | chpasswd
}

function s10_lock_bobs_password() {
    passwd -l bob
}

function s11_include_adam_into_wheel_group() {
    usermod -a -G wheel adam
}

function s12_change_files_permission() {
    for i in {1..33}; do
        chmod -R 640 /tmp/new_file$[3*i];done
}

